A Spring-Powered Launcher Has a Spring with a Spring Constant

Multiple Choice

A spring-powered launcher has a spring with a spring constant of 50.0 N/cm.The launcher is prepared to launch a projectile by compressing the spring by 5.00 cm.If the mass of the projectile is 10.0 grams,then what is the velocity of the projectile when it is launched from the launcher?

A) 65.4 m/s
B) 52.8 m/s
C) 45.7 m/s
D) 40.5 m/s
E) 35.4 m/s